I think if Matthew Vaughn/producers planned to bring back Emma Frost for the next film after FC, this will be the 2nd time that Bryan Singer ditched the producers' plan for Emma Frost.

Your argument would make more sense, if First Class were not also the second film in which Singer tried to include Frost.

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Originally Posted by psylockolussus

After Origins, she was supposed to appear in the Young X-Men movie with Cyclops, but Bryan Singer came up with his own story for First Class/Young X-Men movie and started the story from scratch.

Thank god for that. As much as people complain about January Jones' acting, absolutely nothing was right about Emma Frost in X-Men Origins, acting or otherwise. At least Singer was smart enough to recognize the importance of Frost's villainous background, and the necessary role that plays before the character joins the X-Men, which is more than I can say for her appearance in the Wolverine origin movie (Jesus, Fox).

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Originally Posted by psylockolussus

And now he didn't bring back Emma for DOFP. He's probably not a fan of Emma Frost. Bringing back Colossus over Emma Frost kinda says it all.

Or maybe he recognizes there's little value in Emma returning, now that Fox doesn't appear to be interested in pursuing direct sequels to First Class. January Jones didn't win over fans. There is little that is significant about the character that remains, and she doesn't offer anything that can't be found elsewhere in Days of Future Past.